Calculators
How Many Deck Boards Do I Need?
This phrasing usually means a straight board count for a rectangular deck. Preset: 8 ft wide (96 in) by 12 ft long, 12 ft boards, 10% waste.
Linear feet are rows times length with waste; boards round up to whole lengths. Screw count follows rows × joists × 2.
Your measurements never leave your browser. Estimates only.
| Item | Area | Size | Buy |
|---|---|---|---|
| Deck boards | — | 224.4 linear ft | 19 boards |
| Deck screws | — | 340 screws | 340 screws (~4 lb boxes) |
Assumptions
- Deck size: 96 in wide × 12 ft long
- Board: 5/4×6 or 2×6 (lays at 5.5 in actual), 12 ft long
- Gap between boards: 0.25 in (composite/dry lumber; lay pressure-treated tight if wet)
- Waste factor: 10%
- Rows across width: 17
- Joist spacing: 16 in on center (10 joists)
- Screws: 2 per board per joist crossing
- Estimates only. Check the coverage figure on your product before buying.
Supplies checklist
- Joist hangers and hardware
- Ledger board and lag bolts (attached decks)
- Concrete footings or post anchors
- End-cut sealer (pressure-treated)
- Chalk line and spacer blocks
Estimates only. Check the coverage figure on your product before buying.
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